Investigation of internal nonhomogenous volumes of perturbation as tuning and miniaturization elements for cavity resonators

• Published in: Microwave and optical technology letters Vol. 54; no. 2; pp. 491 - 496
• Main Authors: Dancila, D., Rottenberg, X., Tilmans, H. A. C., De Raedt, W., Huynen, I.
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01.02.2012
• Subjects: cavity resonators; Engineering Science with specialization in Electronics; MEMS; miniaturization; Teknisk fysik med inriktning mot elektronik; tuning
• ISSN: 0895-2477; 1098-2760; 1098-2760
• DOI: 10.1002/mop.26578

In this article, we investigate the tuning and miniaturization performance induced by a volume perturbation inserted in a cavity resonator. The volume perturbation is either a rectangular perturbation centrally located, called central postperturbation (CPP) or dually, a hole shaped in an annular extruded volume, called side annular perturbation (SAP). The tuning and miniaturization mechanism is fully described using the small perturbation theory. This serves the analytical evaluation of the frequency shift resulting from the insertion of the perturbation volume in the cavity resonator. The impact of these perturbations is assessed also by HFSS simulations and measurements of 72 different cavity resonators. An idle cavity resonator characterized by a resonance frequency of 4 GHz is tuned from 1 to 6 GHz. A maximal frequency shift of 3 GHz and 2 GHz is measured for respectively the resonator with CPP and SAP, resulting in a total tuning range of 125%. Additionally, the CPP serves miniaturization purposes, as cavity resonators with a resonance frequency as low as 1 GHz were measured, derived from an idle cavity resonator at 4 GHz. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:491–496, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26578